Test method of automobile transmission system efficiency

The invention relates to a test method of automobile transmission system efficiency, which comprises the following steps: a variable frequency and variable speed motor is connected with an automobile transmission system through a revolution speed and torque sensor; two eddy current dynamometers are respectively connected with two half shafts of the automobile transmission system through the revolution speed and torque sensor; a speed variator of the automobile transmission system is positioned at a certain shift; the target rotation speed of the two half shafts under the rotation speed of a certain variable frequency and variable speed motor is determined according to the transmission ratio; the variable frequency and variable speed motor is started, the eddy current dynamometers load the two half shafts respectively so that the two half shafts can reach the target rotation speed, and then the product of the sum of the torque of the two half shafts and the rotation speed of the half shafts is the output power of the automobile transmission system; and the output power and the product of the torque and the rotation speed of the variable frequency and variable speed motor are compared to obtain the transmission efficiency of the automobile transmission system. The test method is simple, and has quick dynamic response and high testing precision.